20" wheeled kids bike built with many top of the line parts to be as light as possible.

Redline R6 fork (also included is the stock 20" suspension fork and Shimano XTR front brake)
Adjustable stem that will allow you to change riding position as your child grows.
Avid SD 1.9 brake levers
SRAM trigger shifter
SRAM ESP 7.0 rear derailleur
AC crank in a kid friendly 140mm length
Action Tec titanium bottom bracket
Shimano XTR rear v-brake
Salsa seatpost
Salsa seat collar
Custom built wheelset:
Front: American Classic 16 hole hub radial laced.
Rear: White Industries hub built radial non drive and 3x drive side. Shimano XT 8spd 11-32 cassette.

Would also part out if there's no interest in it complete.